more than likely whoever installed evox for you also installed pxhddloader or
complex tools or dvd2xbox.
all you have to do is go to your apps and find pxhddloader or either of those other
2 mentioned above and put your original game in the drive and copy it to your hd.
depending on which evox version you have installed will depend which option you use to get to your apps.
older versions you go to game management,
newer versions you goto launch menu then apps..
hope that helps.
if for some reason you dont have any of those apps installed you will need to ftp one of those apps to your hd in order to cope games..